Stratum: Request and store client versions after authorize
Stratum: Request and store client versions after authorize

Can't do it any sooner, since *gminer error if they get anything unexpected during initialization

svasva/eloipool,uingei/eloipool,thrasher-/eloipool,wizkid057/eloipool,thrasher-/eloipool,imsaguy/eloipool,thrasher-/eloipool,pointgaming/point-gaming-btc,ahmedbodi/SHA-Eloipool-MMCFE-,jameshilliard/4tar-eloipool,uingei/eloi,cinnamoncoin/eloipool-1